S25FL032A Meet Spansion Inc., S25FL032A Datasheet - Page 16

• Manufacturer Part Number: S25FL032A
• Description: 32 Megabit Cmos 3.0 Volt Flash Memory With 50 Mhz Spi Bus Interface
• Manufacturer: Meet Spansion Inc.

9.1
16
Read Data Bytes (READ)
The Read Data Bytes (READ) command reads data from the memory array at the frequency (f
at the SCK input, with a maximum speed of 33 MHz. The host system must first select the device by driving
CS# low. The READ command is then written to SI, followed by a 3-byte address (A23-A0). Each bit is
latched on the rising edge of SCK. The memory array data, at that address, are output serially on SO at a
frequency f
Figure 9.1
any location. The device automatically increments to the next higher address after each byte of data is output.
The entire memory array can therefore be read with a single READ command. When the highest address is
reached, the address counter reverts to 00000h, allowing the read sequence to continue indefinitely.
The READ command is terminated by driving CS# high at any time during data output. The device rejects any
READ command issued while it is executing a program, erase, or Write Status Register operation, and
continues the operation uninterrupted.
SCK
CS#
SI
SO
Mode 3
Mode 0
Hi-Z
and
SCK
, on the falling edge of SCK.
Table 9.4 on page 26
0
1
Command
2
Figure 9.1 Read Data Bytes (READ) Command Sequence
3
4
5
6
detail the READ command sequence. The first byte specified can be at
S25FL032A
7
MSB
23 22 21
8
D a t a
9
24-Bit Address
10
3 2 1 0
S h e e t
28
29
30
31 32 33 34 35 36 37 38 39
MSB
7 6 5
Data Out 1
4
S25FL032A_00_C2 July 2, 2007
3 2 1 0 7
SCK
Data Out 2
) presented